It appears you have not yet registered with our community. To register for free click here
Rebreather World
       

Go Back   Rebreather World Rebreather Models SCR - Semi Closed Rebreathers Semi Closed Rebreathers Semi Closed Rebreathers

Reply
 
LinkBack Thread Tools Display Modes
Old 20th October 2008, 00:09   #1 (permalink)
RBW Member
 
WartedEmperor's Avatar

 
Join Date: Feb 2008
Posts: 21
WartedEmperor is an unknown quantity at this point
Question Dolphin Limiting Factors

Drager Dolphin

0 to 17 msw 125 min with 60% O2 and 40% N2
0 to 22 msw 95 min with 50% O2 and 50% N2
0 to 30 msw 67 min with 40% O2 and 60% N2
0 to 40 msw 47 min with 32% O2 and 68% N2

What is limiting the bottom time for these times? Is it the scrubber or the tank size?

If it is the tank size and I put a bigger tank on it what is the biggest size i could put on?

What is the scrubber duration?
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Old 20th October 2008, 01:38   #2 (permalink)
for a world of water
 
OceanOpportunity's Avatar

 
rEvo II mCCR/SW Predator
Join Date: Nov 2006
Location: Providence, RI USA
Posts: 1,341
OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold OceanOpportunity is a splendid one to behold
Re: Dolphin Limiting Factors

the Dolphin has a decent scrubber. It is tested at about 3 hrs/40msw. Those #'s look like gas duration. more gas, more duration...pretty simple.
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Old 20th October 2008, 02:02   #3 (permalink)
Steve Sprague
 
4ster's Avatar

 
rEvo
Dolphin
Join Date: Mar 2006
Location: Arlington, WA
Posts: 557
4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light
Send a message via Skype™ to 4ster
Re: Dolphin Limiting Factors

Is this a test? Ok, I'll bite:

It looks like the times are the estimates for emptying a 4 liter cylinder.

Depending on your location, Drager made 5 liter cylinders but they are not available in the USA. I have used a Worthington 40 cf (apx 5.9 liters) cylinder and have heard of people using Aluminum 50s (apx 6.9 liters).

The short answer for the scrubber duration is 3 hours.

Steve

Quote: (Originally Posted by WartedEmperor) View Original Post
Drager Dolphin

0 to 17 msw 125 min with 60% O2 and 40% N2
0 to 22 msw 95 min with 50% O2 and 50% N2
0 to 30 msw 67 min with 40% O2 and 60% N2
0 to 40 msw 47 min with 32% O2 and 68% N2

What is limiting the bottom time for these times? Is it the scrubber or the tank size?

If it is the tank size and I put a bigger tank on it what is the biggest size i could put on?

What is the scrubber duration?
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Old 20th October 2008, 06:54   #4 (permalink)
Now showing as "Dean Coote"
 
Numpty diver's Avatar

 
Join Date: Jul 2006
Location: Norway, Bergen
Posts: 487
Numpty diver will become famous soon enough Numpty diver will become famous soon enough Numpty diver will become famous soon enough Numpty diver will become famous soon enough
Re: Dolphin Limiting Factors

you can buy a simple connector for the first stage and put a very comfortable 10 litre tank on the unit.
Extends your times and gives you some extra gas for suit inflation and bcd .
Dean
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Old 20th October 2008, 15:07   #5 (permalink)
wet bear
 
jmurba's Avatar

 
Join Date: May 2006
Posts: 999
jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all
Re: Dolphin Limiting Factors

Quote: (Originally Posted by Numpty diver) View Original Post
you can buy a simple connector for the first stage and put a very comfortable 10 litre tank on the unit.
Extends your times and gives you some extra gas for suit inflation and bcd .
Dean
I've dived for at least one year using a stell 8 liters tanks in scr mode....for me it was a nigthmare , I went back home after diving with horrible backakes.
a ten steel ten liter would be enven worth.
in addition you have to consider that your ABS shell won't resist long holding such a big tank.
I went back to the 5 liter quite fastly...then I used a second Nitrox stage to feed a ray by pass with N40.
the ray by pass was connected to the oxygauge port I did not use cause my sensors were in a T on the inhalation hose.
so I had the 5 liter as a bottom gas tank (I used 25/35 TX) on the Nx 32 jet wich gave me a 20lt/mn flow rater and a 6 liter nitrox tank.

of course I switched to kiss style soon after and used to have time limitations except the scrubber time of course.

regards

jean mi
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Old 20th October 2008, 19:38   #6 (permalink)
Now showing as "Dean Coote"
 
Numpty diver's Avatar

 
Join Date: Jul 2006
Location: Norway, Bergen
Posts: 487
Numpty diver will become famous soon enough Numpty diver will become famous soon enough Numpty diver will become famous soon enough Numpty diver will become famous soon enough
Re: Dolphin Limiting Factors

Hei jean
the shell doesnt completly support the tank, the harness does.
spent a lot of time getting my trim correct then things balenced out ok for me.
I like the dolphin as a fun uncomplicated scr , which i still use.

I have tried to use it as a ccr and with helium.. starts to work out more money then buying a resonable factory built ce approved ccr , was good fun building it though.
Dean
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Old 20th October 2008, 22:12   #7 (permalink)
Gilberto Bonaga, Italy
 
gibbogeo's Avatar

 
Kiss with Hammerhead
Draeger Dolphin
Join Date: Sep 2005
Location: italy
Posts: 413
gibbogeo will become famous soon enough gibbogeo will become famous soon enough gibbogeo will become famous soon enough gibbogeo will become famous soon enough
Send a message via Skype™ to gibbogeo
Re: Dolphin Limiting Factors

Quote: (Originally Posted by jmurba) View Original Post
in addition you have to consider that your ABS shell won't resist long holding such a big tank.
I broke myne quite immediately with a 8 liter steel tank.

Then i installed a second bypass from the ray (seems it is quite common!) and bought an aluminium shell from New Zealand.
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Old 20th October 2008, 23:08   #8 (permalink)
RBW Member
 
WartedEmperor's Avatar

 
Join Date: Feb 2008
Posts: 21
WartedEmperor is an unknown quantity at this point
Re: Dolphin Limiting Factors

Ok I am pretty sure I am going to go with the Dolphin. Do you think it is the best Semi Closed for its price?

Also how hard and expensive are they to convert over to a CCR?
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Old 21st October 2008, 07:19   #9 (permalink)
wet bear
 
jmurba's Avatar

 
Join Date: May 2006
Posts: 999
jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all
Re: Dolphin Limiting Factors

Hi Dean

Quote: (Originally Posted by Numpty diver) View Original Post
Hei jean
the shell doesnt completly support the tank, the harness does.
spent a lot of time getting my trim correct then things balenced out ok for me.
I like the dolphin as a fun uncomplicated scr , which i still use.

++++ trim is the very problem of the dolphin configuration, I ended up with a 3 kg lead bar on the top of my home made shell and 2 2kg soft lest pockets on top of the harness stripes and now I am swiming like a fish .
I've dive the dolphin for years I love it simplicity provided I don't have to undo it at everydive, I only take of the canister and then rince it like this without even removing the tanks, I let the dolphin drying uprigth in the garage , and it is ok.

I have tried to use it as a ccr and with helium.. starts to work out more money then buying a resonable factory built ce approved ccr , was good fun building it though.
Dean
to be honest 1500 euros for a used dolphin, 1000 euros of parts ....it is exactly the price of an OR ...
kissing a dolphin used tyo be a bargain....if alex keeps his price where it is...
I will keep my "dolphin", but I will buy an OR for the rare time I go in clubs and if the OR make my life easier I will leave my dolphin in the garage...well if I can consider my dolphin as a dolphin and if you visit my web you will see it is not obvious.

regards

jean mi
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Old 21st October 2008, 07:24   #10 (permalink)
wet bear
 
jmurba's Avatar

 
Join Date: May 2006
Posts: 999
jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all jmurba is a name known to all
Re: Dolphin Limiting Factors

Quote: (Originally Posted by WartedEmperor) View Original Post
Ok I am pretty sure I am going to go with the Dolphin. Do you think it is the best Semi Closed for its price?

Also how hard and expensive are they to convert over to a CCR?
about 1500 euros at tecme if you get a sensor holder , an oxymeter, the sensors, the hydrogom valve, the oxy reg, the spanner, the shell.

if you add it to the price of a used dolphin....it will mean 3000 euros...where the OR is 2500....

ihmo it is time to wait cause either the third parts maker will low their price either they will go bankrupt
(Offline)
 
Digg this Post!Add Post to del.icio.us
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT. The time now is 11:49.


RebreatherWorld.Com 2005 - 2013
Rebreather World, RBW and the Rebreather World Logo are Trademarks
All rights reserved, no republishing of content without written permission.
By using this website you have agreed to our Terms & Conditions of Use

free counters

Search Engine Optimization by vBSEO 3.1.0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285